A double cutter disc BLDC high-voltage high-power driving motor controller

Abstract

The application relates to the technical field of brushless induction motor driving, and particularly provides a double-cutter BLDC high-voltage high-power driving motor controller, which comprises a double-motor driving composed of a main motor and an auxiliary motor, and is used for electrically controlling the double-motor driving; the controller comprises a man-machine interface module, a control module, a detection module and a power module capable of supplying power for the man-machine interface module, the control module and the detection module; the control module and the man-machine interface module are in data interaction, and the control module comprises a main motor driving circuit and an auxiliary motor driving circuit; the main motor driving circuit is in communication connection with the auxiliary motor driving circuit; the application can realize the purpose of double-motor driving high-power output; through the increase of multiple detection circuits in the controller, the abnormality of an MCU can be detected in real time, the controller can be stopped in time, and the safety performance of the product is further improved.

Description

Technical Field

[0001] This invention relates to the field of brushless sensorless motor drive technology, specifically to a dual-disc BLDC high-voltage high-power drive motor controller. Background Technology

[0002] Currently, brushless sensorless motor drive technology is widely used, and various power tools that convert electrical energy into mechanical energy have brought great convenience to people's lives. High-performance microcontrollers (MCUs) with large storage capacity and high computing speed, as well as high-power and high-voltage switching devices, provide hardware support for brushless sensorless motor drives that meets electrical safety requirements.

[0003] Current brushless sensorless motor drives generally adopt a stand-alone working mode, that is, one controller drives one motor to complete the work that people want to do. The output power is low and cannot meet the needs of high power output.

[0004] Current technology typically treats high-performance microcontrollers (MCUs) and their control software as devices with high security mechanisms. Therefore, product security focuses only on hardware design, while neglecting or paying little attention to the functions that microcontrollers and their circuit structures should perform for product security. As a result, the security performance of products needs to be improved. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a dual-disc BLDC high-voltage high-power drive motor controller to solve the problem of low output power of motors driven by individual drives in the prior art, as well as the problem that the prior art ignores the functions that the controller and its circuit structure should assume for product safety, resulting in the need to improve the safety performance of the product.

[0006] To achieve the above and other related objectives, the present invention provides a dual-disc BLDC high-voltage high-power drive motor controller. The controller is used for electrically controlling dual-motor drive, wherein the dual-motor drive consists of a main motor and an auxiliary motor, and includes: a human-machine interface module, a control module, a detection module, and a power supply module capable of supplying power to the human-machine interface module, the control module, and the detection module.

[0007] The control module interacts with the human-machine interface module and includes: a main motor drive circuit and a secondary motor drive circuit, wherein the main motor drive circuit and the secondary motor drive circuit are communicatively connected.

[0008] The main motor drive circuit includes: an MCU and a bridge circuit. The MCU is connected to the bridge circuit, and the bridge circuit is electrically connected to the main motor. The MCU provides a PWM signal to the bridge circuit, which is used to drive the main motor.

[0009] The auxiliary motor driving circuit comprises an MCU and a bridge circuit, the MCU is connected with the bridge circuit, the bridge circuit is electrically connected with the auxiliary motor, the MCU sends a control signal to the bridge circuit to control the operation of the auxiliary motor, and the MCU of the auxiliary motor driving circuit and the MCU of the main motor driving circuit exchange data through RX / TX pins.

[0010] The detection module is divided into a detection module for detecting the main motor driving circuit and the main motor and a detection module for detecting the auxiliary motor driving circuit and the auxiliary motor, each detection module comprising a motor back electromotive force detection circuit, a motor current detection circuit and a gate current detection circuit.

[0011] Further, the human-computer interface is connected with the MCU of the main motor driving circuit through a plurality of operation switch interfaces, the MCU of the main motor driving circuit is in communication connection with the MCU of the auxiliary motor driving circuit, and a single operation switch interface is connected with a command state synchronization command effective double-line interface in parallel.

[0012] Further, in the main motor driving circuit, the bridge circuit adopts a three-phase bridge circuit, comprising a U phase, a V phase and a W phase, which are connected with three-phase coils of the main motor respectively for driving the main motor to move; two MOS switches are used for each phase, the G poles of the two MOS switches are connected with the MCU, the S pole of the upper bridge MOS switch is connected with the D pole of the lower bridge MOS switch, and the two poles are connected as an output end and connected with one end of the corresponding coil.

[0013] Further, in the detection module for detecting the main motor driving circuit and the main motor, three operational amplifiers U2A, U2B and U2C are used for the motor back electromotive force detection circuit, the same-phase input ends of the three operational amplifiers are connected with the output ends of the U phase, the V phase and the W phase of the full-bridge circuit, and the detection signal is output to the MCU, the detection of whether the back electromotive force is generated through the back electromotive force detection circuit can stop the machine in time, thereby improving the safety of the double-motor driving use.

[0014] Further, in the detection module for detecting the main motor driving circuit and the main motor, an operational amplifier U3A is used for the motor current detection circuit, the same-phase input end of the operational amplifier U3A is connected with the S pole of the W phase lower bridge MOS tube of the full-bridge circuit, the reverse end is connected with the ground, and the output end is connected with the MCU, the accurate detection of the current through the motor current detection circuit can prevent the system from having a short circuit and overcurrent fault, and effectively protect the safety of the system.

[0015] Further, in the detection module for detecting the main motor driving circuit and the main motor, the gate current detection circuit adopts an operational amplifier U3B, the same phase input end of the operational amplifier U3B is the same as the signal of the same direction end of the operational amplifier U3A, the reverse end is grounded, and the output end is connected with the MCU, so that the serious damage of the gate current to the motor control system can be avoided, and the safety of the double motor driving is further improved.

[0016] As described above, the double-cutter BLDC high-voltage high-power driving motor controller provided by the application has the following beneficial effects:

[0017] The main motor and the auxiliary motor driven by the main motor driving circuit and the auxiliary motor driving circuit are arranged, so that the purpose of double-motor driving high-power output is achieved; the two driving circuits are connected through communication to realize real-time information interaction and cooperative work, so that the purpose of simultaneous starting, simultaneous shutdown and simultaneous safe shutdown in crisis is achieved, and the double-motor driving is convenient to use; the multiple detection circuits are added in the controller, so that the abnormality of the MCU can be detected in real time and the machine can be stopped in time, and the safety performance of the product is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A frame schematic diagram of the double-motor driving is shown;

[0019] Figure 2 A control principle diagram of the double-motor driving is shown;

[0020] Figure 3 A circuit diagram of the A part of the power module is shown;

[0021] Figure 4 A circuit diagram of the B part of the power module is shown;

[0022] Figure 5 A circuit diagram of the user interface module is shown; Figure 2

[0023] A MCU circuit of the main motor driving circuit is shown; Figure 6 Figure 2 A principle diagram of the bridge circuit of the main motor driving circuit is shown;

[0024] Figure 7 Figure 2 A principle diagram of the detection module, more specifically, a principle diagram of the motor back electromotive force detection circuit is shown;

[0025] Figure 8 A principle diagram of the detection module, more specifically, a principle diagram of the motor back electromotive force detection circuit is shown; Figure 2

[0026] Figure 9 Figure 2 ​​​​The schematic diagram of the detection module, more specifically, the schematic diagram of the motor current detection circuit;

[0027] Figure 10 As shown in Figure 2 The schematic diagram of the detection module, more specifically, the schematic diagram of the gate current detection circuit. Embodiments

[0028] The following describes the embodiments of the present application by specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure of the specification.

[0029] Figure 1 、 Figure 2 As shown, the present application provides a dual-disk BLDC high-voltage high-power drive motor controller, which is used for electrically controlling dual-motor driving, and the dual-motor includes a main motor and an auxiliary motor. The controller includes a human-computer interface module, a control module, a detection module, and a power module capable of supplying power to the human-computer interface module, the control module, and the detection module. The control module and the human-computer interface module interact with data, and the control module includes a main motor drive circuit and an auxiliary motor drive circuit, which are respectively used for driving the main motor and the auxiliary motor. The main motor drive circuit and the auxiliary motor drive circuit are communicatively connected.

[0030] Figure 3 、 Figure 4 As shown, the circuit diagrams of the A part and the B part of the power module are shown in FIGS. 2A and 2B, respectively. Figure 5 As shown, the user interface module is shown in FIG. 3, and the power-on / off switch can be used to control the power-on of the entire controller. The front-stage voltage reduction stabilizing chip U5 of the B part outputs a 15V voltage, and the secondary voltage reduction stabilizing chip U9 works, and outputs a working voltage, such as a 3.3V voltage, which is used for supplying power to other modules.

[0031] As shown in FIG. 4, the control module includes a main motor drive circuit and an auxiliary motor drive circuit. Figure 2 、 Figure 5 、 Figure 6 、 Figure 7As shown, the main motor driving circuit comprises: MCU, bridge circuit, the MCU is connected with the bridge circuit, and the bridge circuit is electrically connected with the main motor; the auxiliary motor driving circuit comprises: MCU, bridge circuit, the MCU is connected with the bridge circuit, and the bridge circuit is electrically connected with the auxiliary motor; the RX / TX pin of the MCU of the auxiliary motor driving circuit is connected with the CON4 interface of the human-computer interface module, the RX / TX pin of the MCU of the main motor driving circuit is connected with the CON5 interface of the human-computer interface module, CON4 is connected with CON5, the RX in the CON4 interface is connected with the TX in the CON5 interface, and the TX in the CON4 interface is connected with the RX in the CON5 interface, so that the data interaction between the MCUs of the main motor driving circuit and the auxiliary motor driving circuit is realized, the two driving circuits are connected through communication to realize real-time information interaction and collaborative work, for example, simultaneous starting, simultaneous shutdown, simultaneous safe shutdown in crisis and convenient use of double-motor driving.

[0032] In combination Figure 5 , Figure 6 As shown, the human-computer interface module is further connected with the MCU of the main motor driving circuit through a plurality of operation switch interfaces, and a command state synchronous double-line interface is connected in parallel on a single operation switch interface; only when the same command state is detected by the double-line interface, the command of the opening or closing of any switch interface is finally determined to be valid; if different command states are detected at the same time, it is judged that the system is in error, and the system enters a safe stop state; the double-line interface can ensure that the operation command of the user is effectively and reliably transmitted to the MCU.

[0033] Further, the plurality of operation switch interfaces comprise a PTO switch interface, a SEAT switch interface and an RMO switch interface, the PTO switch interface is connected in parallel with a PTO_DET1 interface and a PTO_DET2 interface, the SEAT switch interface is connected in parallel with a SEAT_DET1 interface and a SEAT_DET2 interface, and the RMO switch interface is connected in parallel with an RMO_DET1 interface and an RMO_DET2 interface.

[0034] In combination Figure 2 , Figure 6 , Figure 7 As shown, taking the main motor driving circuit as an example, the MCU adopts an STSPIN32F0252 chip, and outputs a PWM wave to the control end of the bridge circuit; the bridge circuit adopts a three-phase bridge circuit, comprising a U phase, a V phase and a W phase, which are respectively connected with three-phase coils of the main motor for driving the main motor to act; two MOS switches are used for each phase, the G poles of the two MOS switches input control signals of the MCU, the S pole of the MOS switch of the upper bridge is connected with the D pole of the MOS switch of the lower bridge, and the two poles are connected as an output end and connected with one end of the corresponding coil.

[0035] The MCU of the auxiliary motor driving circuit is connected to the bridge circuit in the same way as the main motor driving circuit, and thus is not described again.

[0036] In combination Figure 2 , the detection circuit is divided into: a detection module for detecting the main motor driving circuit and the main motor, and a detection module for detecting the auxiliary motor driving circuit and the auxiliary motor. Each detection module includes: a motor back electromotive force detection circuit, a motor current detection circuit, and a brake current detection circuit.

[0037] For example, the main motor driving circuit of Figure 6 , Figure 7 includes the following detection modules: Figure 8 a motor back electromotive force detection circuit as shown in Figure 9 , a motor current detection circuit as shown in Figure 10 , and a motor brake current detection circuit as shown in

[0038] Figure 8 The motor back electromotive force detection circuit is shown in the figure. The motor back electromotive force detection circuit uses three operational amplifiers U2A, U2B, and U2C. The same-phase input terminals of the three operational amplifiers are respectively connected to the three-phase output terminals of the full-bridge circuit, and the output terminals are connected to the PA0, PA1, and PA2 pins of the MCU through the CON3 interface. The motor back electromotive force detection plays a key role in the motor driving control system. It determines the commutation step and accuracy of the brushless and non-inductive motor. The back electromotive force of the motor has a current-limiting effect, which can affect the internal characteristics of the motor. By detecting whether the back electromotive force is generated, the motor driving abnormality can be detected in time, and the motor can be controlled to stop safely, thereby improving the safety of the dual-motor driving.

[0039] Figure 9 As shown in the figure, the motor current detection circuit uses an operational amplifier U3A. The same-phase input terminal of the operational amplifier U3A is connected to the S pole of the W-phase lower bridge MOS tube of the full-bridge circuit, the reverse terminal is connected to ground, and the output terminal is connected to the PA5 pin of the MCU. Accurate current monitoring can prevent short circuit and overcurrent faults in the system, effectively protecting the safety of the system. Therefore, motor current detection is crucial in the motor control system.

[0040] Figure 10 As shown in the figure, the brake current detection circuit uses an operational amplifier U3B. The same-phase input terminal and the reverse input terminal of the operational amplifier U3B are respectively connected to the same-phase input terminal and the reverse input terminal of the operational amplifier U3A. The output terminal of the operational amplifier U3B is connected to the CIN pin of the MCU. Brake current, also known as braking current, is the current generated during motor reverse braking. It is larger than the current during "stuck" and can cause serious damage to the motor control system. By detecting the brake current, the safety of the dual-motor driving can be further improved.

[0041] The detection circuit described above is for the detection of the main motor driving circuit and the main motor part, and the detection circuit of the auxiliary motor driving circuit and the auxiliary motor part is the same as the detection circuit described above, and is not redundantly introduced.

[0042] In conclusion, the double-cutter BLDC high-voltage high-power driving motor controller provided by the application has reasonable design and compact structure, the main motor and the auxiliary motor driven by the main motor driving circuit and the auxiliary motor driving circuit are arranged, the purpose of double-motor driving high-power output is achieved, the two driving circuits are connected through communication to realize real-time information interaction and cooperative work, the purpose of simultaneous starting, simultaneous shutdown and simultaneous safe shutdown in crisis is achieved, the double-motor driving is convenient to use, multiple detection circuits are added in the controller, the abnormality of the MCU can be detected in real time and the machine can be stopped in time, and the safety performance of the product is further improved. Therefore, the application effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0043] The above embodiments only exemplarily illustrate the principles and effects of the application, and are not used to limit the application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the application should be covered by the claims of the application.

Claims

1. A double cutter head (BLDC) high-voltage high-power drive motor controller, comprising a double motor drive composed of a main motor and an auxiliary motor, the controller being used for electrically controlling the double motor drive; comprising a man-machine interface module, a control module, a detection module, and a power module capable of supplying power to the man-machine interface module, the control module and the detection module; the control module interacts with the man-machine interface module in data, and comprises a main motor drive circuit and an auxiliary motor drive circuit, the main motor drive circuit being communicatively connected with the auxiliary motor drive circuit; the main motor drive circuit comprises an MCU and a bridge circuit, the MCU being connected with the bridge circuit, and the bridge circuit being electrically connected with the main motor; the auxiliary motor drive circuit comprises an MCU and a bridge circuit, the MCU being connected with the bridge circuit, and the bridge circuit being electrically connected with the auxiliary motor, and the MCU of the auxiliary motor drive circuit and the MCU of the main motor drive circuit interact in data through RX / TX pins; the detection module is divided into a detection module for detecting the main motor drive circuit and the main motor, and a detection module for detecting the auxiliary motor drive circuit and the auxiliary motor, each detection module comprising a motor back electromotive force detection circuit, a motor current detection circuit and a gate current detection circuit; the man-machine interface is connected with the MCU of the main motor drive circuit through a plurality of operation switch interfaces, and the MCUs of the main motor drive circuit and the auxiliary motor drive circuit are communicatively connected, and a single operation switch interface is connected in parallel with a command state synchronization command effective double-line interface. characterized in that In the main motor drive circuit, the bridge circuit adopts a three-phase bridge circuit, comprising a U-phase, a V-phase and a W-phase, each phase adopting two MOS switches, the G-poles of the two MOS switches being connected with the MCU, and the S-pole of the upper bridge MOS switch being connected with the D-pole of the lower bridge MOS switch. In the detection module for detecting the main motor drive circuit and the main motor, the motor back electromotive force detection circuit adopts three operational amplifiers, the same-phase input ends of the three operational amplifiers being connected with the output end of the full-bridge circuit, and the output end being connected with the MCU. In the detection module for detecting the main motor drive circuit and the main motor, the motor current detection circuit adopts an operational amplifier U3A, the same-phase input end of the operational amplifier U3A being connected with the S-pole of the W-phase lower bridge MOS tube of the full-bridge circuit, and the output end being connected with the MCU. In the detection module for detecting the main motor drive circuit and the main motor, the gate current detection circuit adopts an operational amplifier U3B, the input end of the operational amplifier U3B being connected with the input end of the U3A, and the output end being connected with the MCU. ​ 2. The dual cutterhead BLDC high voltage high power drive motor controller of claim 1, wherein: ​ 3. The dual cutterhead BLDC high voltage high power drive motor controller of claim 1, wherein: ​ 4. The dual cutterhead BLDC high voltage high power drive motor controller of claim 1, wherein: ​ 5. The dual cutterhead BLDC high voltage high power drive motor controller of claim 1, wherein: ​ 6. The dual cutterhead BLDC high voltage high power drive motor controller of claim 5, wherein: ​

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